Estimation of Hardness using DEFORM$^{TM}$ in SKH9 High Speed Steel

DEFORM$^{TM}$을 이용한 SKH9 고속도공구강의 경도 예측

  • 박준홍 (동아대학교 신소형재가공청정공정개발연구센터) ;
  • 성장현 (동아대학교 신소재공학과) ;
  • 김영희 (동아대학교 신소재공학과) ;
  • 이해우 (동아대학교 신소재공학과) ;
  • 전언찬 (동아대학교 기계공학과) ;
  • 박영철 (동아대학교 기계공학과)
  • Received : 2007.05.26
  • Accepted : 2007.06.13
  • Published : 2007.07.30

Abstract

The hardness of cold-forged products is in close relationship with its effective strain. This study presented the estimating method of hardness for cold-forged SKH9 products without hardness tests in view of resistance to plastic deformation using finite element code, DEFORM$^{TM}$. The flow stress equation obtained from the compression test was only used as a basic data to estimate the relationship between effective strain and hardness. In addition, this new estimating method was applied to the cold-forged product which was widely used in industrial field to show the feasibility. As a result, the predicted hardness numbers through FE simulation showed good agreement with the measured hardness numbers. It is possible to estimate the hardness not by hardness tests, but by only computer simulations for the deformed products. Also, effective strain values were possibly estimated by measuring hardness numbers, and vice versa.

Acknowledgement

Supported by : 산업자원부

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